CN2245680Y

CN2245680Y - Claw type rotor vacuum pump

Info

Publication number: CN2245680Y
Application number: CN 95216018
Authority: CN
Inventors: 徐曦
Original assignee: Individual
Current assignee: Xu Xi
Priority date: 1995-07-12
Filing date: 1995-07-12
Publication date: 1997-01-22
Anticipated expiration: 2005-07-12

Abstract

The utility model relates to a claw type rotor vacuum pump which is composed of a multistage pump chamber 4, a rotor pair 3, a partition board 12, a driving shaft 8, a driven shaft 9, a motor 13 and a base 6. A phase angle of a second stage rotor is lagged in 120 DEG than a phase angle of a first stage rotor, a phase angle of each later stage rotor is lagged in 50 to 70 DEG than a phase angle of each previous stage rotor. Gas among all stage of rotors is smoothly operated, and vacuum pumping effect can reach 1 to 10 Pa. The motor 13 is positioned above the base 6, and gear system transmission is arranged in an oil tank of the base 6. Thus, the maintenance is convenient without oil leakage, and the total height of the pump is reduced. The utility model is provided with a gas bag 20, and thus the utility model can extract the gas which can coagulate and the gas with dust. The utility model is suitable for extracting the air, the gas which can be coagulated, and the gas with the dust.

Description

The claw rotor vacuum pump

This reality useful novel the rotor vacuum pump that relates to, particularly claw rotor vacuum pump.

Existing claw rotor vacuum pump is to adopt paired claw rotor by the two rotation that is meshing with each other, to compress through rotor rotation from the gas that suction port enters, in the dividing plate below exhaust port enters, be that the exhaust port of upper level dividing plate sucks the air in the dividing plate from suction port by the rotor of next stage again, through the next stage rotor compression, in the dividing plate below exhaust port enters it, so one-level one-level ground sucks compression, thereby is evacuated.As number of patent application 93106586.0, jaw vacuum pump series a kind of vacuum pump that comes to this, it is fine to be used for the extracting vacuum effect.But also there is certain shortcoming in this vacuum pump, promptly 1. since rotors at different levels to, the phase angle difference is less, it or not optimum range, cause in the pump between rotors at different levels the gas operation not smooth, cause certain excessive compression, so the vacuum limiting value of extraction can only reach 10 to 100Pa; 2. because the motor 21 that driving shaft 25 passes the fuel tank bottom and is positioned at fuel tank below links to each other, make seal ring leakage of oil easy to wear bottom the fuel tank, maintenance difficult causes dead time long; 3. motor 21 is positioned at driving shaft 25 belows, installation and maintenance inconvenience, and cause the height of pump to increase, transportation inconvenience.

The claw rotor vacuum pump that it is 1～10Pa that the utility model purpose provides a kind of degree of vacuum that can reach capacity, its gear tank is oil-proof, and motor mounting is easy to maintenance, and the height of pump decreases, convenient transportation, and can extract coercibility and band dirty air.

The utility model is to realize like this, it is by multistage pump chamber 4, the rotor that is positioned at pump chamber 4 is to 3 and multistage dividing plate 12, driving shaft 8, driven shaft 9, motor 13 and base 6 are formed, rotors at different levels are formed by two intermeshing claw rotors 3, dividing plate 12 and rotor are to 3 alternate laying, rotors at different levels vertically are connected on respectively on driving shaft 8 and the driven shaft 83, rotors at different levels keep phase angle difference successively between 3, make the phase angle of rotor right phase angle in the second level than the first order, along rotor rotation direction hysteresis 105 to 125 degree, the right phase angle of later rotor at different levels is than the phase angle of upper level, lag behind 50 to 70 degree like this along the rotor rotation direction, when making the upper level pump chamber be in exhaust, adjacent next stage pump chamber is in best suction location, make gas flow happy, when having avoided owing to the exhaust of upper level pump chamber, adjacent next stage pump chamber is in not exclusively air-breathing or suction condition not as yet, cause the gas operation not smooth, cause the excessive compression of gas, make gas by between pump chamber and rotor and the gap between rotor and rotor, regurgitation volume strengthens, it is 1～10Pa that the effect of bleeding that has influenced pump makes it not reach degree of vacuum, this programme is owing to avoided the gas excessive compression, driving shaft 8 and driven shaft 9 discontinuity equalizations have also been avoided, the shortcoming that power loss is more.Have the base 6 that is the casing shape bottom, the axle lower end of driving shaft 8, driven shaft 9 extend into wherein; Motor 13 is positioned on the base 6 of driving shaft 8 one sides, its main shaft extend into wherein, in the casing of base 6, driving shaft 8 axle heads are equipped with gear 7, driven shaft 9 axle heads are equipped with and gear 7 meshed gears 10, on motor 13 main shafts gear 14 is housed, by intermediate gear 15 and gear 7 engagements carrying out transmission.Because whole axles stretch into fuel tank from the top, have avoided the problem of original structure leakage of oil and inconvenient maintenance, the total height of pump is reduced; Gas ballasting 20 is installed, enables to extract the vacuum of condensable gas and band dirty air, enlarged using scope.

In sum and since rotor of the present utility model between the phase angle be in best operating range, its effect of bleeding is improved can reach 1～10Pa; Motor 13 is installed in above the base 6, utilize the gear train transmission that is positioned at base 6 fuel tanks leakage of oil neither can take place, make the motor mounting maintenance convenient again, and the overall height of pump reduces convenient transportation; Have gas ballasting, enlarged the using scope of this pump.

Do concrete introduction with embodiment below.

Fig. 1 is a plan view of the present utility model;

Fig. 2 is the A-A sectional view among Fig. 1;

Fig. 3 is the B-B sectional view (turning 90 degrees counterclockwise) among Fig. 1;

Fig. 4 is the C-C sectional view among Fig. 3 (only illustrate rotor to);

Fig. 5 is the E place enlarged view among Fig. 2.

Figure 1 shows that plan view of the present utility model, show the mounting point, at base 6 upper left sides driving shaft 8 driven shafts 9 are housed and reach the relevant pump housing, dividing plate etc., motor 13 is equipped with on the right side; Fig. 2,3 is depicted as this pump structure schematic representation, this example is the level Four rotor pump, the shell 4 ' of the outside of pump chamber 4 for fusing with it, water jacket 19 ' is arranged between the two, the level Four rotor that is positioned at pump chamber 4 to 3 and level Four dividing plate 12, driving shaft 8, driven shaft 9 and motor 13 all be contained on the base 6, rotors at different levels are connected on driving shaft 8 and the driven shaft 9 by Vertical direction 3; As Fig. 4, every grade of rotor is formed by two intermeshing claw rotors 3, rotor is positioned at pump chamber 4, its upper and lower end face has the suction port 1 that rotor is used by 12 sealings of hollow dividing plate in upper level dividing plate lower end surface, has the relief opening 5 that rotor is used in the upper-end surface of next stage dividing plate, rotor is pressed arrow and is rotated to engagement, when going to (b) position by (a) position, the gas in A chamber is compressed and begins to relief opening 5 exhausts, and it is big and air-breathing from suction port 1 that B chamber volume becomes; When rotor continues to go to (C) position, A cavity volume minimum is shown in stain section C, this moment, air aspiration cavity B became maximum, be air-breathing end of a period, C chamber gas reexpands, and rotor motion is to (a) position, repeat said process again, as Fig. 3, gas is right through the level Four rotor from suction port 1, discharges from the relief opening 5 of last dividing plate 12.In the present embodiment, phase angle is 120 degree that lag behind between the second level and the first order, the second level, between three grades of level Four, phase angle lag behind successively 60 the degree, its suction port 1 angle is 180 to 190 degree, relief opening 5 angles 65 to 75 degree, as Fig. 2,3, base 6 is a box parts, interior dress lubricant oil 17, and dividing plate 12 and rotor are to 3 alternate being placed on the base 6, the axle head of driving shaft 8 driven shafts 9 all extend in the base 6, respectively be set with the master on the axle head, driven

gear

7,10 intermesh, and motor 13 is contained on base 6 end faces of driving shaft 8 one sides, and its main shaft extend in the base 6, gear 14 on motor 13 main shafts is connected through intermediate gear 15 with gear 7 on the driving shaft 8, because motor 13 is installed in base 6 above rather than below, has avoided the shortcoming of leakage of oil of axis hole seal ring and installation and maintenance inconvenience, and the total height of pump is reduced; On driving shaft 8, driven shaft 9, respectively has a straight-through keyway 30 with these two axis parallels, in keyway 30, be equipped with and be used for each rotor of transmission to each keys 29 of 3 usefulness, straight-through keyway is simple than single keyway processing, the position is accurate, guarantees that each rotor is accurate to 3 phase angle.Between driving shaft 8, driven shaft 9 are with each dividing plate 12 spiral sleeve 18 is housed and seals, bearing 2,11 is equipped with at these two two ends, and dividing plate 12 is a hollow parts, and end face has suction port and has relief opening in its lower end surface thereon.As Fig. 5, in the side of each dividing plate 12 gas ballasting 20 is housed, it penetrates from the shell 12 ' that fuses with dividing plate 12 and is contained on the dividing plate 12, be made up of throttle valve 22, sealing gasket 23, depression bar 24, top board 25, valve seat 26, the outlet 27 of valve seat 26 is led to the inner chamber of dividing plate 12, and the upper end of the shoulder hole of valve seat 26 is by top board 25 sealings, depression bar 24 is housed in the shoulder hole of valve seat 26, be positioned at above the diaphragm seal 23, hole 28 sealings that interlink with throttle valve 22, these throttle valve 22 buyables.This gas ballasting has throttling action, and when needs gas entered, outside gas 21 was washed sealing gasket 23, seal bar 24 open through throttle valve 22 from entering the mouth, and through exporting 27, arrives in the dividing plate 12, by the adjusting to throttle valve 22, guarantees to suck an amount of air-flow; Also have non-return effect, when gas in the dividing plate 12 greater than or during near balancing gas pressure, under action of gravity, depression bar 24 compresses sealing pad 23 and makes that gases do not outflow in the dividing plate 12, plays non-return effect.Adopt this gas ballasting 20, this pump can extract condensable gas, band dirty air.Around base 6, pump chamber 4, dividing plate 12, be provided with water jacket 19 and 19 ', the interior all frictional heats of pump are left.This pump is applicable to the gas that extracts inflammable and explosive, condensable gas, dust is arranged, the burn into toxic gas is arranged, and also can be used for preventing greasy dirt, distillation, drying, deaeration etc. and generally vacuumizes use.

Claims

1, claw rotor vacuum pump, form by multistage dividing plate (12), driving shaft (8), driven shaft (9) and motor (13) that multistage pump chamber (4), the rotor that is positioned at pump chamber (4) are laid at interval to (3), with pump chamber (4), rotors at different levels are formed by two intermeshing claw rotors (3), rotors at different levels vertically are connected on respectively on driving shaft (8) and the driven shaft (9) (3), it is characterized in that: the rotor right phase angle more right than the rotor of the first order, phase angle in the second level spent along the sense of rotation hysteresis 105 to 125 of rotor, and the best is 120 degree; Later rotor at different levels is between (3), and than the right phase angle of adjacent previous stage rotor, along the right sense of rotation of rotor 50 to 70 degree that lag behind, the best is 60 degree to back primary rotor to the phase angle of (3).

2, claw rotor vacuum pump according to claim 1, it is characterized in that: also have the base (6) that is the casing shape, the axle lower end of driving shaft (8), driven shaft (9) extend in the base (6), motor (13) is positioned on the base (6) of driving shaft (8) one sides, its main shaft extend in the base (6), driving shaft (8) axle head in base (6) is equipped with gear (7), the axle head of driven shaft (9) is equipped with and gear (7) meshed gears (9), on motor (13) main shaft gear (14) is housed.

3, claw rotor vacuum pump according to claim 2 is characterized in that: the gear (14) on described motor (13) main shaft is by intermediate gear (15) and driving gear (7) engagement.

4, claw rotor vacuum pump according to claim 1 and 2 is characterized in that: on driving shaft (8) and driven shaft (9), respectively have a straight-through keyway (30) with axis parallel.

5, claw rotor vacuum pump according to claim 4, it is characterized in that: gas ballasting (20) is housed on each dividing plate (12), it is made up of throttle valve (22), sealing gasket (28), depression bar (24), top board (25), valve seat (26), the outlet (27) of valve seat (26) interlinks with dividing plate (12) inner chamber, the upper end of the shoulder hole of valve seat (26) is sealed by top board (25), depression bar (24) is housed in the shoulder hole of valve seat (26) is pressed in above the diaphragm seal (23), will seal with the hole (28) that throttle valve (22) interlink.